: It ensures that a 28-day strength test in one lab is directly comparable to a test in another.

For years, hardened concrete testing was governed by the BS 1881 series, which was a cornerstone for UK practitioners. The BS EN 12390 series, including Part 2, has largely replaced these older methods. While the new procedures might seem familiar, they incorporate crucial differences in tolerances and equipment specifications, requiring practitioners to conduct a thorough review. Understanding this shift from the familiar BS 1881 to the harmonized European standards is as important as mastering the new technical requirements.

Two common curing regimes specified in related standards (and referenced by EN 12390-2) include:

Understanding BS EN 12390-2:2019: Making and Curing Test Specimens

Proper curing is critical for cement hydration. Without a temperature-controlled, humid environment, the concrete will not develop its intended strength profile. Initial Curing (In the Mold)

Mechanical vibration (vibrating table or poker) or manual tamping with a compacting bar. Goal: To achieve a fully dense specimen without voids. 1.3 Finishing

The document outlines specific laboratory and field procedures to maintain the integrity of concrete samples from the moment they are cast until they are tested for hardened strength:

The BS EN 12390-2:2019 standard is a critical document for civil engineers, laboratory technicians, and construction professionals involved in concrete quality control. This European Standard specifies the methods for making and curing test specimens for strength tests on hardened concrete. Compliance with this standard ensures that concrete strength results are accurate, repeatable, and representative of the material's true potential. Understanding the Significance of the Standard

Insert the poker vertically across a grid of points, ensuring it does not touch the bottom or sides of the mold. Withdraw the poker slowly to allow the hole left by the vibrator to close cleanly.

This part of the EN 12390 series applies to specimens made from concrete with a maximum aggregate size of 40 mm or less. It covers the preparation of cubes, cylinders, and prisms. The standard is used both for specimens made in a laboratory setting and those made on-site to verify the quality of concrete being delivered to a structure. Essential Equipment Requirements

. The specimens must remain visibly wet at all times; a dry surface means moisture is evaporating, which halts cement hydration. Summary of Key Compliance Tolerances Standard Requirement (BS EN 12390-2:2019) in hot climates) Time Before Demolding 16 hours minimum to 72 hours maximum Permanent Curing Temp Moisture Room Humidity relative humidity 6. Common Site Errors and How to Avoid Them

This standard is vital for guaranteeing that laboratory test results accurately represent the actual concrete placed on-site. Following this standard ensures consistency in how concrete cubes and cylinders are handled, cured, and prepared for testing. 1. Scope and Purpose of BS EN 12390-2:2019

The construction industry relies heavily on the quality and durability of concrete to ensure the structural integrity of buildings, bridges, and other infrastructure projects. One crucial aspect of concrete quality control is testing hardened concrete to determine its mechanical properties. This is where BS EN 12390-2:2019 comes into play. In this article, we will provide an in-depth look at the BS EN 12390-2:2019 standard, its significance, and the testing procedures for hardened concrete.

The primary objective is to create a standardized environment. By controlling temperature, humidity, and handling, the standard ensures that the strength measured in the lab provides a reliable basis for the acceptance of the concrete batch.

Immediately cover the filled molds with a plastic sheet, damp burlap, or a tight-fitting plate. This prevents early moisture evaporation due to wind or dry air.

Fill the mould and apply vibration using a vibrating table or internal poker until no further large air bubbles appear on the surface and the surface becomes smooth and glazed. Avoid over-vibration, which causes aggregate segregation.